Improved swage for sharpening saw-teeth



J. E. EMERSON.

Swage 'for Sharpening Saws.

Pat-entedlune 5, 1866.

Fay' f3 iINrTED STATES PATENT Grrrcn,

JAMES E. EMERSON, OF TRENTON,x NEW JERSEY.

IMPROVED SWAGE FOR SHARPENING SAW-TEETH.

Specification forming part of Letters Patent N0. 55,262, dated June 5, 1866.

'.To all whom it may concern:

Beit known that I, JAMEs E. EMERsoN, of Trenton, Mercer county, State of New Jersey, have invented a new and Improved Swage for Sharpening Saw Teeth; and I do hereby declare that the following is a full, clear, and exact description thereof', which will enable others skilled in the art to make and use the same, reference bein g had to the accompanying drawings, forming part of this specification, in which- Figure l is a side view of my invention; Fig. 2, a longitudinal central section of the same; Fig. 3, a front view of a saw-tooth sharpened by my improved implement; Fig. 4, an end view of my improved implement; Fig. 5, a detached perspective View of the die pertaining to the same; Fig. 6, a detached and enlarged front view of the die. y

Similar letters of reference indicate like parts.

This invention relates to a new and improved swage for sharpening saw-teeth. The swages hitherto used for this purpose, so far as bringing the tooth to a proper cutting-ed ge was concerned, answered quite well, but the diiculty attending their use consisted in their inability to give the edge of the tooth any required shape or proportion. For instance, the edge of some teeth would be made too broad, others too narrow, and many would not be ofthe proper form, and hence, after sharpening the teeth of asaw, they require to be dressed up or finished by iiling.

My invention consists in providing the swage or implement with a die constructed in such a manner that, while serving as av portion of the swage to bring the point of 'the tooth to a proper feather or sharp edge, it will also serve to give a proper shape and size to the point or cutting-edge of the tooth, so' that all the teeth of a saw will correspond both in shape and dimensions.

A represen tswhat may be termed the shank7 or body 7 of my improved implement, which may be of steel throughout and of slightly taper form, as shown in Figs. l and 2. The large end of this shank is formed with an extended lip, a, one surface of which (the inner one) is a plane and at the inner end of this lip in the shank there is made a recess, b, of circular form in its transverse sectionV to receive a cylindrical die, B, which is formed with a lip, c, to bear or rest against the end d of the shank, as shown clearly in Figs. l and 2. This die is of steel, and it is formed with a recess, e, the sides of which are inclined, as shown at f f in Fig. 6, and the bottom is slightly covex, as shown at g. This die is tempered extremely hard, as hard as may be, at the side in which the recess e is made, and the same may be said of the inner surface of the lip (t.

The die B is inserted in its recess bin the shank A in such a position that the recess c will have a proper relative position with the inner surface of the lip a, the bottom of c and the inner surface of a forming the swage.

The implement is adjusted to the point of the tooth C, the latter hung in the angle formed by the inner surface, a, and the bottom of the recess c, as shown in red in Fig. 2, and the small end of the shank A is struck by a hammer and the end of the tooth upset or swaged into the proper or desired form, the inner surface of the lip a giving the proper shape to the outer side of the tooth, the bottom of the recess e giving the proper shape to the bottom or under side of the tooth, the outer and under sides of the latter being brought to a `feather-edge, while the sides ff of the recess c give the proper shape to the sides of the tooth. The tooth, it will be seen, cannot be spread laterally beyond the sides of the recess e, and hence all the teeth of a saw will be swaged to a corresponding size and shape, and will require no dressing up or finishing with a file. Different dies having different-sized recesses e maybe used as circumstances may require.

'In order to insure uniformity and regularity in'the projection of the cutting-edge of the tooth a guidinggroove, h, `(shown in Figs. 2V

and 4,) is formed in the under side of the shank of the punch A, which groove 4receives the outer edge of that tooth which nextpreccdes the tooth to be dressed, so that the punch and its die will be always guided directly and-perpendicularly to the edge of the tooth under treatment and bear equally upon every part of its width, thus preventing any Obliquity of the tooth and preserving for the line of its cutting-edge a direction at right angles with the plane of the saw.

It will be found expedient under some circumstances to sharpen the tooth by successive operations. In this case a movable pin having one or more dies, Fig. 7, for progressive formation, is used in the swage, the dies tirst used merely forming' the teeth too nearly the size necessary to ill the nishing-dies, and giving them uniformity of direction and thick ness, when their cutting-edge will be iinished by shifting the pin in its position in the swage, using the die for that purpose.

I do not claim, broadly, the sharpening of sawteeth by means of a swage, for such iinplement has been used for that purpose 5 but I do claim as new and desire to secure by Letters Patent- 1. A swage for sharpening the teeth of saws,

.i lil 

